When winter arrives, it’s common to assume that pest activity will slow down. In reality, colder weather often pushes pests out of the cold and into commercial premises in search of warmth, food and shelter. This seasonal shift means winter can be a high-risk period for infestations, particularly if your building offers easy access or suitable harbourage. So what are the most common commercial pests in winter? And how can you protect your business, maintain hygiene standards and remain compliant with health and safety regulations?

Rodents (Rats and Mice)

Rodents are by far the most common commercial pests in winter. As outdoor temperatures drop, rats and mice actively seek heated environments with reliable food sources. Commercial buildings such as offices, warehouses, restaurants and retail units are particularly attractive.

You may notice increased rodent activity from late autumn onwards. Signs include droppings, gnaw marks, grease smears along walls and unusual noises in ceilings or voids. Even a small infestation can present serious risks, as rodents are capable of spreading disease, contaminating stock and damaging electrical wiring.

Winter conditions also mean rodents are more likely to remain indoors once they gain access. Without professional intervention, populations can grow rapidly, making early detection essential.

Stored product insects

Stored product insects, including beetles and moths, remain active throughout winter if conditions allow. These pests infest dry goods such as flour, cereals, grains, pet food and spices. Warehouses, food manufacturers, retailers and hospitality venues are particularly vulnerable.

While cooler temperatures slow outdoor insect activity, heated storage areas provide ideal breeding conditions. You may discover infestations during stock rotation or audits, often long after the pests have become established.

Left untreated, stored product insects can lead to significant product loss, reputational damage and non-compliance with food safety standards.

Flies (Including Cluster Flies)

Although flies are more commonly associated with summer, certain species remain a winter issue for commercial premises. Cluster flies, for example, enter buildings in autumn to hibernate and often emerge during warmer spells in winter.

You may find flies gathering around windows, light fittings or upper floors. In food-handling environments, even small numbers of flies pose a hygiene risk and can raise concerns during inspections.

Winter fly activity is often overlooked, allowing infestations to persist unnoticed until numbers increase.

Ants (Indoor Species)

Most outdoor ant species are dormant in winter, but some indoor species remain active year-round. In commercial settings, these ants establish nests within heated buildings and forage for food regardless of the season.

You are most likely to encounter ants in kitchens, staff areas and food storage rooms. Winter infestations usually indicate that ants are nesting inside the structure itself, rather than entering from outdoors.

Because winter ant activity is less visible, infestations can be missed until they become more established.

Birds

Birds such as pigeons, gulls and starlings become a more prominent issue during winter. As natural food sources decline, birds seek shelter and roosting sites on commercial buildings.

You may notice increased nesting, droppings and noise around roofs, ledges, signage and loading bays. Bird activity can cause structural damage, create slip hazards and present health risks due to droppings.

Winter weather also means birds are more persistent once they settle, making early deterrence important.

Why does winter pest control matter?

During winter, pests are more reliant on indoor environments for survival. This makes infestations harder to resolve if they are not addressed quickly. You may also face increased scrutiny from regulators, insurers and customers who expect safe and hygienic premises year-round.

A proactive winter pest management approach reduces the risk of costly infestations and operational disruption. Regular inspections, proofing measures and professional monitoring help ensure pests are detected before they become a serious issue.

Protecting your premises

You can reduce winter pest risks by sealing entry points, managing waste effectively, maintaining good housekeeping standards and addressing moisture issues. Heating systems, storage areas and voids should be checked regularly, as these are common pest harbourage sites.

Working with a professional pest control provider ensures your premises remain protected throughout the colder months, with tailored solutions suited to your industry and risk level.

Here at Wipeout UK, our team have the expertise, skills, tools and techniques to provide effective pest control all year round, including in the winter months. Whether your property is a domestic or commercial building, we are the team you can count on for exceptional pest control results. Why not get in touch today to find out more about how we can help?